HOT TAP Calculation Thickness

CALCULATION

 A. GENERAL INFORMATION ●

Tie In Point

:

Hot Tap to Tank 1

●

Tie In Method

:

Weldolet Hot Tap

●

Existing Line

:

18 inch of pipe

●

Operating Pressure

:

170 psig

●

Existing Pipe Thickness

:

0.38 inch

●

Weldolet

:

6 x 18 inch

●

Pressure Test Method

:

Leak Test with Nitrogen

●

Leak Test Pressure

:

187 psig / 12.9 bar 

Thickness Calculation based on ASME B31.8

t

Min Minimum imum desi design gn wal wall thic thickn knes ess, s, in

P

Inte Intern rnal al Pres Pressu sure re in pipe pipe,, psi psi

do

OD of pipe, in

Sy

Min Minimum imum Yiel Yieldd Str Stres esss for for pip pipe

F

Design Factor  

E

Long Longit itud udin inal al weld weld-j -jooint int fa facto ctor 

T

Temperature de derat rating fa factor  Calculated Values :

P

Internal Pressure in pipe, psi

170 psi

do

OD of pipe, in

Sy

Minimum Yield Stress for pipe (Table 9.12)

F

Design Factor (Table 9.13)

E

Longitudinal weld-joint factor (Table 9.14)

1

T

Temperature derating factor (Table 9.15)

1

18 in 35000 0.72

Result

t

Calculated Required Wall Thickness, in

t

Actual Result :

0.06071 in 0.38 in

0 .3 8

> SAFE

0.0607143